The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)
α = 45° + φ/2
α = 45° - φ/2
α = 90° + φ
α = 90° - φ
- The example of spherical pair is
- Creep in belt drive is due to
- The natural frequency of free transverse vibrations due to uniformly distributed load acting over a…
- The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.
- Which of the following mechanism is an approximate straight line motion mechanism?
- Which is the false statement about the properties of instantaneous centre?
- Kinematic pairs are those which have
- The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is
- If two moving elements have surface contact in motion, such pair is known as
- Whitworth quick return mechanism is obtained by inversion of
- When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of…
- The cam follower generally used in automobile engines is
- The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity…
- If the opposite links of a four bar linkage are equal, the links will always form a
- In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
- Which of the following is an open pair?
- The displacement of a flat faced follower when it has contact with the flank of a circular arc cam,…
- The frictional torque transmitted by a cone clutch is same as that of
- For the same lift and same angle of ascent, a smaller base circle will give
- Transmission of power from the engine to the rear axle of an automobile is by means of
- The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane…
- When the speed of the engine fluctuates continuously above and below the mean speed, the governor is…
- The example of completely constrained motion is a
- The coriolis component of acceleration depends upon
- Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel,…
- What is the number of instantaneous centres for an eight link mechanism?
- A rotary internal combustion engine has __________ cylinders.
- Oldham's coupling is the
- The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω…
- At the nodal point in a shaft, the amplitude for torsional vibration will be